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D. H. CAMPBELL.

Sewing Machine.

' Patented M'ay17gl88l.

wires STATES DUNCAN H. CAMPBELL, OF PAVTUGKET, RHODE ISLAND, ASSIGNOR OFTHREE-FOURTHS TO HENRY B. METOALF, FRANK E. COMEY, AND DANIEL MCNIVEN,ALL OF SAME PLACE.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 241,611, dated May17,1881,

Application filed May 14, 1879.

To all whom it may concern:

Be it known that I, DUNCAN H. CAMPBELL, of Pawtucket, in the county ofProvidence and State of Rhode Island, have invented certain new anduseful Improvements in Sewing-Machines; and I do hereby declare that thefollowing specification, taken in connection with the drawingsfurnished, and forming a part thereof, is a full, clear, and completedescription of my invention.

My improvements relate to the shuttle, its race, and'its driver, andthey are particularly applicable to wax-thread machines in which ahook-needle and a centrally-pointed sh nttle are employed.

In certain other applications for Letters Patent filed by me May 131111114, 1879, and

respectively designated as Cases No. 1, A, B, G, and E, I have shown anddescribed certain novel features in centrallypointed shuttles, and inthe methods of mounting and of operating them. In all the machinesdevised by me up to the time of male ing my present invention theshuttles have been provided on their under side with a 1onthehook-needle slightly ascends beneath the shuttle, the loop is freed fromthe-needle, and

in some of said machines said recess is of value in co-operating withthe needle only; but in others the recess is also occupied by a shuttleInv rail, on which the shuttle moves to and fro. those prior machines,wherein the shuttle-re- 'cess referred to is not used as a means formounting the shuttle on a central rail, additional recesses have beenprovided in the sides of the body of the shuttle for mounting it in itsrace. I have termed the shuttle used by me a centrally-pointed shuttle,because its point and axis occupy the same plane as the path of thehook-needle used therewith.

I have now devised acentrally-pointed shuttle of the character referredto, which differs from any other heretofore made, so far as my knowledgeextends, in that it has a longitudi-V na-l T-sha-ped web on its underside for engagement with a race reversely recessed for receiving the webof the shuttle, and confining it against undue lateral or verticalmovement, whilefree to movelongitudinally. Suchashuttle may be also soconstructed that a portion of this web may operate as a cast-off for thehook-needle, or, as provided for in a certain other application forLetters Patent filed by me, (Case E,) the shuttle-driver may be reliedupon for thatservice independently of the shuttle; and myinventionpartially consists in a shuttle provided with a longitudinal T- shapedweb, which is broken away centrally to afford space within which thepoint of a hook-needle may enter for casting off a loop.

I am well aware that heretofore, in combination with an eye-pointedneedle, a flat-sided shuttle has been provided with a T-shaped splineforoccupyingacorrespondingly-grooved side of its race; but in such case theaxis of the shuttle and the path of the needle occupy difierent planes,and the portion of the race which is cut away to afford a path for theneedle does not operate as a stop for the loop, because the eye of theneedle exercises the entire retaining control thereof.

Splined or dovetailed shuttles have also heretofore been employed incombination with hook'needles; but in such cases the point of theshuttle is projected laterally, so as to occupy a plane to the one sideof the axis of the shuttle for intersecting the path of the needle, andtherefore additional mechanism is requisite for enabling the shuttle toproperly enter and pass through its loop, Whereas a centrallypointedshuttle (having its axis and its point in the plane occupied by the pathof a hookneedle) enters the loop centrally, and forces it open equally,to the right and the left, and the loop is stopped from moving forwardwith the shuttle by abutting against the surface of the rail, asarranged by me andshown in my several applieations for patenthereinbefore referred to.

The shuttle-rail employed by me with this shuttle is novel in that it isprovided with a T-shaped longitudinal recess for receiving the T-shapedweb of the shuttle, and is broken away centrally to afford a path for aneedle in the plane occupied by the axis and point of the shuttle, andalso to afford adjacent to said path a surface which operates as a stopfor preventing a loop from being unduly moved forward by the shuttle inits passage, and such a rail, in combination with a shuttle having aT-shaped web, constitutes another portion of my invention.

For accurate adjustment of the shuttle on its rail, and compensating forwear from time to time, my invention further consists in thecombination, with a shuttle having a longitudinal T-shaped web, of arail provided with a T-shaped recess to receive the web, and composed oftwo parallel sections which are adjustable by means of screws withreference to each other and to the web of the shuttle.

My invention further consists in the combination, with acentrally-pointed shuttle provided with a T-shaped web, a rail brokenaway to afford a path for a needle and recessed to receive the web ofthe shuttle, of a suitable shuttle-driver.

In certain other applications for Letters Patent filed by me, ashereinbefore designated, I show shuttle-drivers of varied construction,which may be used in the combination last stated; but I have devised andherein show a novel driver, which consists of a slide mounted on guidesindependent of the shuttle-rail, and a frame, which surrounds theshuttle longitudinally, is pivoted to its slide, and is locked by alatchfor maintainingitin proper working relations with the shuttle.

To more particularly describe my invention, I will refer to theaccompanying drawings, in which- Figure 1 represents the front portionof the bed of amachineembodyingmyimprovements, with a portion of theframe broken away to show the shuttle and the adjacent parts. Fig. 2represents the same in vertical section. Fig. 3 represents theshuttle-rail, detached. Fig. 4

' represents the shuttle-driver, detached. Figs.

5 and 6 represent the shuttle respectively in side view andcross-section.

The hook-needle A, as heretofore, risesfrom below and carries a loopdownward.

The shuttle-rail B is broken away centrally at a, to afford a path forthe needle, and the rail in front of the needle is squared off, toafford a good contact for a loop, to prevent its moving forward with theshuttle. provided with a central-longitudinal T-shaped recess, 1), forthe reception of the shuttle-web, hereinafter described. This rail maybe solidly constructed, but I prefer to divide it longitudinally intotwo parts, as shown at c 0, and to connect them with lateral screws 07,by which they may be set, with relation to each other and to the web ofthe shuttle, for attaining accurate adjustment. The ends of the rail areprovided with flanges and secured by screws to the frame of the machine,and the screws The rail is should be so arranged as to afford a verticaland lateral adjustment of the rail.

The shuttledriver C is mounted in guides wholly independent of the rail,and is composed, in part, of a slide, 0, connected by a link to thevibrating lever f. This driver is novel so far as relates to the frameg, which wholly surrounds the shuttle, engages with the heel and neckthereof, and is pivoted to the slide. It has, also, a spring -latch, g,on the slide, which engages with the front part of the frame, and formaintaining it in proper contact with the shuttle during its forwardmovement. In a certain other application for Letters Patent (Case A) Ihave shown a hinged bridle, which engages only with the neck of theshuttle, and is hinged to a slide, which engages with the heel of theshuttle. The frame being lifted admits of the withdrawal of the shuttleby sliding it along the rail outward through a hole in the side of themachine.

The shuttle D, centrally pointed in the sense hereinbefore set forth, isunlike any heretofore made by me or others, so far as I know, in that ithas a longitudinal T- shaped web, h, on its under side, in line with andbelow its point. This T-shaped web may be employed solely as a means forsecurely mounting the shuttle on its rail, or it may be broken awaycentrally, longitudinally, and laterally, as at t, so that a hookneedlemay rise into the space thus afforded for casting off a loop, as with aweb longitudinally recessed throughout its length, as heretoforeprovided for by me. The recessi in the web may be dispensed with as acast-off, if other means be provided for that purpose, as set forth inanother application for Letters Patent (Case E) filed by me. When notrecessed for use as a cast-off the web may be much reduced in size, soas to project but little from the shuttle, and its retainingshoulderscan then be reduced to a minimum, so that but little if any contact willoccur between it and a loop, especially if the latter be retained by theneedle until the shuttle has passed through, as provided for by me inanother application for Letters Patent. (Case E.)

It will be seen that the axis of the shuttle, its point, and the path ofthe needle all occupy the same vertical plane.

The operation of the several parts will be readily understood in view ofthe detailed description.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. The combination,with the centrally-pointed shuttlehaving a T-shaped web on its lower side, of the shuttle-race grooved toreceive the shuttle -web, and broken away centrally, and the hook-needlehaving its path centrally located within the race and coincident withthe axis of the shuttle, substantially as described.

2. Acentrally-pointed shuttle provided with a longitudinal T-shaped webbroken awaycentrally to operate as a cast-off for a hook-needle,substantially as described.

3. The combination, with a centrally-pointed shuttle having alongitudinal T shaped web on its under side, of a shuttle-rail recessedto recive the web of the shuttle, broken away centrally to afford a pathfor a needle in the plane occupied by the axis and the point of theshuttle, and which has adjacent to said path a surface which operates asastop for preventing a loop from being carried forward by the sh uttle,substantially as described.

4. The combination, with a shuttle having a T-shaped web on its underside, of a rail, recessed to receive said web, composed of two parallelsections and provided with screws for adjusting the same with referenceto each other and to the web, substantially as described.

5. The combination, with a centrally-pointed shuttle provided with a Tshaped web on its under side, a shuttle-rail broken away centrally toafford a path foraneedle in the plane occupied by the point and axis ofthe shuttle, and recessed to receive the web of the shuttle, of ashuttle-driver, substantially as described.

6. The shuttle-driver mounted on independent guides consisting of aslide, a frame pivoted to the slide for surrounding the shuttle, and alatch for maintaining the frame in proper relations with the shuttle,substantially as described.

DUNCAN H. CAMPBELL. Witnesses: CHARLES E. DAVIS, J 0s. E. JENCKES.

